diff --git a/gio/tests/meson.build b/gio/tests/meson.build
index e4b4959cb9ee7888f58e9e5545cf936a8abe29c5..a1b41872dea33b1f6eaeb9020616be232aa9aea7 100644
--- a/gio/tests/meson.build
+++ b/gio/tests/meson.build
@@ -140,11 +140,16 @@ if host_machine.system() != 'windows'
           'slow-connect-preload.c',
           name_prefix : '',
           dependencies: cc.find_library('dl'),
+          install_dir : installed_tests_execdir,
+          install: installed_tests_enabled,
         )
       ],
       'env' : {
         'LD_PRELOAD': '@0@/slow-connect-preload.so'.format(meson.current_build_dir())
       },
+      'installed_tests_env' : {
+        'LD_PRELOAD': '@0@/slow-connect-preload.so'.format(installed_tests_execdir),
+      },
       'suite': ['flaky'],
     },
     'gschema-compile' : {'install' : false},
@@ -593,11 +598,21 @@ foreach test_name, extra_args : gio_tests
   source = extra_args.get('source', test_name + '.c')
   extra_sources = extra_args.get('extra_sources', [])
   install = installed_tests_enabled and extra_args.get('install', true)
+  installed_tests_env = extra_args.get('installed_tests_env', {})
 
   if install
     test_conf = configuration_data()
     test_conf.set('installed_tests_dir', installed_tests_execdir)
     test_conf.set('program', test_name)
+    test_env_override = ''
+    if installed_tests_env != {}
+      envs = []
+      foreach var, value : installed_tests_env
+         envs += '@0@=@1@'.format(var, value)
+      endforeach
+      test_env_override = '@0@ @1@ '.format(env_program.path(), ' '.join(envs))
+    endif
+    test_conf.set('env', test_env_override)
     configure_file(
       input: installed_tests_template_tap,
       output: test_name + '.test',
diff --git a/glib/tests/meson.build b/glib/tests/meson.build
index 814ddbe01f5053d4c8d216da8744ce92adadb559..d54fc41fac655c7dd7c51682355fc50d55765b0a 100644
--- a/glib/tests/meson.build
+++ b/glib/tests/meson.build
@@ -183,6 +183,7 @@ foreach test_name, extra_args : glib_tests
     test_conf = configuration_data()
     test_conf.set('installed_tests_dir', installed_tests_execdir)
     test_conf.set('program', test_name)
+    test_conf.set('env', '')
     configure_file(
       input: installed_tests_template_tap,
       output: test_name + '.test',
diff --git a/gobject/tests/meson.build b/gobject/tests/meson.build
index 44d4588d1868ed7a0539f8a8260c7393d7f0a56d..b7fb2364cdb6918d52fd4dc8dd8f34c490981f07 100644
--- a/gobject/tests/meson.build
+++ b/gobject/tests/meson.build
@@ -77,6 +77,7 @@ foreach test_name, extra_args : gobject_tests
     test_conf = configuration_data()
     test_conf.set('installed_tests_dir', installed_tests_execdir)
     test_conf.set('program', test_name)
+    test_conf.set('env', '')
     configure_file(
       input: installed_tests_template_tap,
       output: test_name + '.test',
diff --git a/meson.build b/meson.build
index 98907ca1687ea86a3ab8362f06eab48fe9a7cf69..ad8c4cdd829eb8f6aa5a65a755ceedd367964ba5 100644
--- a/meson.build
+++ b/meson.build
@@ -1893,6 +1893,9 @@ endif
 have_bash = find_program('bash', required : false).found() # For completion scripts
 have_sh = find_program('sh', required : false).found() # For glib-gettextize
 
+# Some installed tests require a custom environment
+env_program = find_program('env', required: installed_tests_enabled)
+
 # FIXME: How to detect Solaris? https://github.com/mesonbuild/meson/issues/1578
 if host_system == 'sunos'
   glib_conf.set('_XOPEN_SOURCE_EXTENDED', 1)
diff --git a/template-tap.test.in b/template-tap.test.in
index 6adf73f0369d5ccfa4a5b2777fd73756569d330b..30cd1668612ebd0e1955ad32ee75a37410e20257 100644
--- a/template-tap.test.in
+++ b/template-tap.test.in
@@ -1,4 +1,4 @@
 [Test]
 Type=session
-Exec=@installed_tests_dir@/@program@ --tap
+Exec=@env@@installed_tests_dir@/@program@ --tap
 Output=TAP
diff --git a/tests/gobject/meson.build b/tests/gobject/meson.build
index 4b1c690857a0f81bd10a01ec53d5ee81e27c4b43..eabaea5b2c62190bb9af38f2f6e59aa39db93954 100644
--- a/tests/gobject/meson.build
+++ b/tests/gobject/meson.build
@@ -66,6 +66,7 @@ foreach test_name, extra_args : gobject_tests
     test_conf = configuration_data()
     test_conf.set('installed_tests_dir', installed_tests_execdir)
     test_conf.set('program', test_name)
+    test_conf.set('env', '')
     configure_file(
       input: template,
       output: test_name + '.test',
diff --git a/tests/meson.build b/tests/meson.build
index 1d53db288f54a0c4aa6a03dcc1549f2598376b93..11075dd8ebb8edefe9544dcdc32d4f90ae1a8df5 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -109,6 +109,7 @@ foreach test_name, extra_args : tests
     test_conf = configuration_data()
     test_conf.set('installed_tests_dir', installed_tests_execdir)
     test_conf.set('program', test_name)
+    test_conf.set('env', '')
     configure_file(
       input: template,
       output: test_name + '.test',
diff --git a/tests/refcount/meson.build b/tests/refcount/meson.build
index 22b9655d7721fd15bdccfa1f28a8802eef35dd08..e17e38b454f21fbac833d3a6015a713afc8fb3d9 100644
--- a/tests/refcount/meson.build
+++ b/tests/refcount/meson.build
@@ -36,6 +36,7 @@ foreach test_name, extra_args : refcount_tests
     test_conf = configuration_data()
     test_conf.set('installed_tests_dir', installed_tests_execdir)
     test_conf.set('program', test_name)
+    test_conf.set('env', '')
     configure_file(
       input: installed_tests_template,
       output: test_name + '.test',